Using a Sony Ericsson K790 - it was pretty easy to create this panoramic picture of Tokyo. The phone basically guides you to take three separate pictures using the first and second as "ghosted" guides - so you match up the partial picture you've taken with what you really see in the background and then take the next picture. It's cool they can fit this software into a phone.
Tokyo is amazingly expansive. I've been there four or five times now and feel like I haven't even scratched the surface. The direction in which this picture was taken doesn't even show most of the action. Mt. Fuji would be in the background if it were not so cloudy.